EP2237987B2 - Reinforced energy absorption device and assembly - Google Patents

Reinforced energy absorption device and assembly Download PDF

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Publication number
EP2237987B2
EP2237987B2 EP08865295.3A EP08865295A EP2237987B2 EP 2237987 B2 EP2237987 B2 EP 2237987B2 EP 08865295 A EP08865295 A EP 08865295A EP 2237987 B2 EP2237987 B2 EP 2237987B2
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EP
European Patent Office
Prior art keywords
energy absorption
absorption device
bridge
plate
rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP08865295.3A
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German (de)
French (fr)
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EP2237987A2 (en
EP2237987B1 (en
Inventor
Julien Meghira
Joël CANTELEUX
Pierre Bequet
Serge Pignaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Faurecia Sieges dAutomobile SAS
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Faurecia Sieges dAutomobile SAS
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Application filed by Faurecia Sieges dAutomobile SAS filed Critical Faurecia Sieges dAutomobile SAS
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Publication of EP2237987B1 publication Critical patent/EP2237987B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/4207—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces
    • B60N2/4214—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces longitudinal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42709—Seats or parts thereof displaced during a crash involving residual deformation or fracture of the structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42727—Seats or parts thereof displaced during a crash involving substantially rigid displacement
    • B60N2/42745—Seats or parts thereof displaced during a crash involving substantially rigid displacement of the back-rest

Definitions

  • the invention relates to an energy absorption device by deformation, in particular for a motor vehicle seat in the event of an impact, and an assembly comprising two energy absorption devices.
  • An energy absorption device of this type is usually known and in particular disclosed in the document US2004 / 0061364 .
  • the invention aims to reduce the cost and improve the robustness of this type of absorption device.
  • the bridge has at the edge of at least one of the cutouts a collar having at least locally a thickness greater than the thickness of the plate, the rod being able to deform the bridge to 'when it breaks.
  • the term “collar” will be understood to mean a zone of curved material, here a zone of the material of the plate.
  • the plate is reinforced at the level of the collar, and consequently its thickness can be reduced. The material cost is thus reduced, as is the weight of the device.
  • said plate can locally serve for the energy absorption device and more generally constitute a flange of the seat structure without generating a material cost or a significant weight of the seat.
  • the collar is preferably annular and borders the first cutout. two under the action of the same constraint exerted between the first element and the second element.
  • the energy to be absorbed during the impact can be distributed in order to reduce the thickness of the plate of each energy absorption device.
  • the first absorption device energy and the second energy absorption device are preferably adapted so that the bridge of the second energy absorption device breaks before the bridge of the first energy absorption device.
  • the energy absorption is thus more constant and better controlled, especially when the saddles include a slot.
  • the figures 1 to 5 illustrate a seat 10 for a motor vehicle comprising, at each of its lateral ends, a seat structure flange 6, a backrest structure flange 8, an adapter flange 34 connected to the backrest structure flange 8 by an articulation 36 and an energy absorption assembly 1 interposed between the adapter 34 and the seat structure flange 6. (also clockwise) around the axis X 2 of the rod 29 of the second energy absorption device 4.
  • the shape of the second cutout 14, 24 of each energy absorbing device 2, 4 is such that the bridge 16, 26 is narrower at each of its ends, thus creating a rupture initiator at each end of the bridge 16 , 26, which improves the level of effort and reproducibility (consistency of result for a series of devices).
  • FIG 6 illustrates an alternative embodiment outside the scope of the invention, differing from the embodiment illustrated in figures 1 to 5 in that the bridge of the first energy absorption device 2 and the bridge of the second energy absorption device 4 separating the first cutout 12, 22 from the second cutout 14, 24 comprise two portions 16a, 16b; 26a, 26b separated by a slot 17, 27 connecting the first cutout 12, 22 to the second cutout 14, 24.
  • the slot 17, 27 being substantially narrower than the rod 19, 29, the movement of the rod 19, 29 of the first energy absorption device 2 and of the second energy absorption device 4 causes the deformation of the portions. 16a, 16b; 26a, 26b of the bridges in a manner similar to what has been described in relation to the figures 4 and 5 .
  • the slot 17, 27 has a width less than half the diameter of the rod 19, 29.
  • the slot has a width preferably between 2 millimeters and 6 millimeters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Dampers (AREA)
  • Seats For Vehicles (AREA)

Description

L'invention concerne un dispositif d'absorption d'énergie par déformation en particulier pour siège de véhicule automobile en cas de choc et une ensemble comprenant deux dispositifs d'absorption d'énergie.The invention relates to an energy absorption device by deformation, in particular for a motor vehicle seat in the event of an impact, and an assembly comprising two energy absorption devices.

Plus précisément l'invention concerne un dispositif d'absorption d'énergie du type comprenant :

  • une plaque d'épaisseur sensiblement constante comportant au moins une première découpe et une deuxième découpe séparées par un pontet, et
  • une tige s'étendant à travers la première découpe.
More precisely, the invention relates to an energy absorption device of the type comprising:
  • a plate of substantially constant thickness comprising at least a first cutout and a second cutout separated by a bridge, and
  • a rod extending through the first cutout.

Un dispositif d'absorption d'énergie de ce type est usuellement connu et notamment divulgué dans le document US2004/0061364 .An energy absorption device of this type is usually known and in particular disclosed in the document US2004 / 0061364 .

DE 10 2004 032 785 décrit un dispositif selon le préambule de la revendication 1. DE 10 2004 032 785 describes a device according to the preamble of claim 1.

L'invention vise à réduire le coût et à améliorer la robustesse de ce type dispositif d'absorption.The invention aims to reduce the cost and improve the robustness of this type of absorption device.

Pour ce faire, conformément à l'invention, le pontet comporte en bordure d'au moins l'une des découpes un collet présentant au moins localement une épaisseur supérieure à l'épaisseur de la plaque, la tige étant apte à déformer le ponter jusqu'à sa rupture.To do this, according to the invention, the bridge has at the edge of at least one of the cutouts a collar having at least locally a thickness greater than the thickness of the plate, the rod being able to deform the bridge to 'when it breaks.

On comprendra par collet une zone de matière recourbée, ici une zone de la matière de la plaque. Ainsi, la plaque est renforcée au niveau du collet, et par conséquent son épaisseur peut être réduite. Le coût matière est ainsi réduit, de même que le poids du dispositif. En outre, ladite plaque peut localement servir pour le dispositif d'absorption d'énergie et plus globalement constituer un flasque de structure de siège sans engendrer un coût matière ou un poids important du siège.The term “collar” will be understood to mean a zone of curved material, here a zone of the material of the plate. Thus, the plate is reinforced at the level of the collar, and consequently its thickness can be reduced. The material cost is thus reduced, as is the weight of the device. In addition, said plate can locally serve for the energy absorption device and more generally constitute a flange of the seat structure without generating a material cost or a significant weight of the seat.

Selon une caractéristique complémentaire, de préférence le collet est annulaire et borde la première découpe. deux sous l'action d'une même contrainte s'exerçant entre le premier élément et le deuxième élément.According to an additional characteristic, the collar is preferably annular and borders the first cutout. two under the action of the same constraint exerted between the first element and the second element.

Ainsi, l'énergie à absorber lors du choc peut être répartie afin de réduire l'épaisseur de la plaque de chaque dispositif d'absorption d'énergie.Thus, the energy to be absorbed during the impact can be distributed in order to reduce the thickness of the plate of each energy absorption device.

Selon une caractéristique complémentaire, l'ensemble d'absorption d'énergie présente avantageusement les caractéristiques suivantes :

  • le deuxième dispositif d'absorption d'énergie comprend également une tige et une plaque, la plaque comprenant au moins une première découpe et une deuxième découpe séparées par un pontet, la tige s'étendant à travers la première découpe,
  • pour chaque dispositif d'absorption d'énergie, la tige et la plaque sont solidaires pour l'un du premier élément et pour l'autre du deuxième élément,
  • le pontet du premier dispositif d'absorption d'énergie s'oppose à la rotation du deuxième élément par rapport au premier élément autour de l'axe de la tige du deuxième dispositif d'absorption d'énergie dans un sens absorption d'énergie, et
  • le pontet du deuxième dispositif d'absorption d'énergie s'oppose à la rotation du deuxième élément par rapport au premier élément autour de l'axe de la tige du premier dispositif d'absorption d'énergie également dans le sens absorption d'énergie.
According to an additional characteristic, the energy absorption assembly advantageously has the following characteristics:
  • the second energy absorption device also comprises a rod and a plate, the plate comprising at least a first cutout and a second cutout separated by a bridge, the rod extending through the first cutout,
  • for each energy absorption device, the rod and the plate are integral for one of the first element and for the other of the second element,
  • the bridge of the first energy absorption device opposes the rotation of the second element relative to the first element around the axis of the rod of the second energy absorption device in an energy absorption direction, and
  • the bridge of the second energy absorption device opposes the rotation of the second element relative to the first element around the axis of the rod of the first energy absorption device also in the energy absorption direction .

Selon une autre caractéristique complémentaire conforme à l'invention, le premier dispositif d'absorption d'énergie et le deuxième dispositif d'absorption d'énergie sont de préférence adaptés pour que le pontet du deuxième dispositif d'absorption d'énergie se rompe avant le pontet du premier dispositif d'absorption d'énergie.According to another additional characteristic in accordance with the invention, the first absorption device energy and the second energy absorption device are preferably adapted so that the bridge of the second energy absorption device breaks before the bridge of the first energy absorption device.

L'absorption d'énergie est ainsi plus constante et mieux maitrisée, surtout lorsque les pontets comprennent une fente.The energy absorption is thus more constant and better controlled, especially when the saddles include a slot.

D'autres caractéristiques et avantages de la présente invention apparaîtront dans la description détaillée suivante, se référant aux dessins annexés dans lesquels :

  • la figure 1 illustre un ensemble d'absorption d'énergie conforme à l'invention,
  • la figure 2 est une vue à échelle agrandie de la zone repérée II à la figure 1, avant choc,
  • la figure 3 est une vue en coupe suivant la ligne repérée III-III à la figure 2,
  • la figure 4 illustre l'ensemble d'absorption d'énergie conformément à la figure 2, en cours d'absorption du choc,
  • la figure 5 illustre l'ensemble d'absorption d'énergie conformément à la figure 2, en fin d'absorption du choc,
  • la figure 6 illustre une variante d'ensemble d'absorption d'énergie, hors du cadre de l'invention.
Other characteristics and advantages of the present invention will become apparent from the following detailed description, with reference to the appended drawings in which:
  • the figure 1 illustrates an energy absorption assembly in accordance with the invention,
  • the figure 2 is a view on an enlarged scale of the area marked II on the figure 1 , before shock,
  • the figure 3 is a sectional view along the line marked III-III at the figure 2 ,
  • the figure 4 illustrates the energy absorption assembly according to figure 2 , in the process of absorbing the shock,
  • the figure 5 illustrates the energy absorption assembly according to figure 2 , at the end of shock absorption,
  • the figure 6 illustrates an alternative energy absorption assembly, outside the scope of the invention.

Les figures 1 à 5 illustrent un siège 10 pour véhicule automobile comprenant, à chacune de ses extrémités latérales, un flasque de structure d'assise 6, un flasque de structure de dossier 8, un flasque formant adaptateur 34 relié au flasque de structure de dossier 8 par une articulation 36 et un ensemble d'absorption d'énergie 1 interposé entre l'adaptateur 34 et le flasque de structure d'assise 6.
(dans le sens horaire également) autour de l'axe X2 de la tige 29 du deuxième dispositif d'absorption d'énergie 4.The figures 1 to 5 illustrate a seat 10 for a motor vehicle comprising, at each of its lateral ends, a seat structure flange 6, a backrest structure flange 8, an adapter flange 34 connected to the backrest structure flange 8 by an articulation 36 and an energy absorption assembly 1 interposed between the adapter 34 and the seat structure flange 6.
(also clockwise) around the axis X 2 of the rod 29 of the second energy absorption device 4.

La forme de la deuxième découpe 14, 24 de chaque dispositif d'absorption d'énergie 2, 4 est telle que le pontet 16, 26 est plus étroit à chacune de ses extrémités, créant ainsi une amorce de rupture à chaque extrémité du pontet 16, 26, ce qui améliore le niveau d'effort et la reproductibilité (constance de résultat pour une série de dispositifs).The shape of the second cutout 14, 24 of each energy absorbing device 2, 4 is such that the bridge 16, 26 is narrower at each of its ends, thus creating a rupture initiator at each end of the bridge 16 , 26, which improves the level of effort and reproducibility (consistency of result for a series of devices).

La figure 6 illustre une variante de réalisation hors du cadre de l'invention, se distinguant du mode de réalisation illustré aux figures 1 à 5 en ce que le pontet du premier dispositif d'absorption d'énergie 2 et le pontet du deuxième dispositif d'absorption d'énergie 4 séparant la première découpe 12, 22 de la deuxième découpe 14, 24 comprennent deux portions 16a, 16b ; 26a, 26b séparés par une fente 17, 27 reliant la première découpe 12, 22 à la deuxième découpe 14, 24.The figure 6 illustrates an alternative embodiment outside the scope of the invention, differing from the embodiment illustrated in figures 1 to 5 in that the bridge of the first energy absorption device 2 and the bridge of the second energy absorption device 4 separating the first cutout 12, 22 from the second cutout 14, 24 comprise two portions 16a, 16b; 26a, 26b separated by a slot 17, 27 connecting the first cutout 12, 22 to the second cutout 14, 24.

La fente 17, 27 étant sensiblement plus étroite que la tige 19, 29, le déplacement de la tige 19, 29 du premier dispositif d'absorption d'énergie 2 et du deuxième dispositif d'absorption d'énergie 4 engendre la déformation des portions 16a, 16b ; 26a, 26b des pontets de manière similaire à ce qui a été décrit en relation avec les figures 4 et 5.The slot 17, 27 being substantially narrower than the rod 19, 29, the movement of the rod 19, 29 of the first energy absorption device 2 and of the second energy absorption device 4 causes the deformation of the portions. 16a, 16b; 26a, 26b of the bridges in a manner similar to what has been described in relation to the figures 4 and 5 .

De préférence, la fente 17, 27 présente une largeur inférieure à la moitié du diamètre de la tige 19, 29.Preferably, the slot 17, 27 has a width less than half the diameter of the rod 19, 29.

Ainsi, pour une tige 19, 29 de 12 millimètres de diamètre, la fente présente une largeur de préférence comprise entre 2 millimètres et 6 millimètres.Thus, for a rod 19, 29 of 12 millimeters in diameter, the slot has a width preferably between 2 millimeters and 6 millimeters.

Le positionnement d'une fente 17, 27 tangentiellement au déplacement d'une tige 19, 29 par rotation autour de l'axe X1, X2 de l'autre tige favorise la rotation de l'adaptateur 34 et de la structure de dossier 8 autour de l'axe de l'autre dispositif d'absorption d'énergie.The positioning of a slot 17, 27 tangentially to the movement of a rod 19, 29 by rotation about the axis X 1 , X 2 of the other rod promotes the rotation of the adapter 34 and of the backrest structure 8 around the axis of the other energy absorption device.

Claims (8)

  1. Device (2) for absorbing energy by deformation, in particular for a motor vehicle seat (10) in the event of an impact, wherein the energy absorption device (2) comprises:
    - a plate (20) of substantially constant thickness (e), featuring at least a first cut-out (12) and a second cut-out (14) separated by a bridge (16), and
    - a rod (19) which extends through the first cut-out (14),
    wherein the bridge (16) comprises, on the edge of at least one of the cut-outs (12), a collar (18), which has at least locally a thickness (E) which is greater than the thickness (e) of the plate (20), characterized in that the rod is able to deform the bridge (16) until fracture.
  2. Energy absorption device according to claim 1, wherein the collar (18) is annular and is on the edge of the first cut-out (12).
  3. Energy absorption device according to claim 1 or claim 2, wherein the collar (18) extends substantially perpendicularly to the main part of the plate and locally increases the thickness (e) of said plate by between 100% and 200%.
  4. Energy absorption device according to claim 3, wherein the thickness (e) of the main part of the plate (20) is between 1.5 and 2.5 millimetres, and the bridge (18) has a thickness (E) of between 3 and 6 millimetres.
  5. Energy absorption device according to any of the previous claims, wherein the plate (20) is work hardened at the collar (18) to increase its hardness.
  6. Energy absorption assembly (1) comprising a first energy absorption device (2) according to any of claims 1 to 5 and a second energy absorption device (4), both intended to be inter-posed between a first element (6) and a second element (8) in order to hold them with respect to one another by absorbing the high stresses exerted between said first (6) and second (8) elements, wherein said first energy absorption device (2) and said second energy absorption device (4) are distant from one another and are adapted so that they both deform under the action of a same stress exerted between the first element (6) and the second element (8).
  7. Energy absorption assembly (1) according to claim 6, wherein:
    - the second energy absorption device (4) also has a rod (29) and a plate (30), wherein the plate (30) comprises at least a first cut-out (22) and a second cut-out (24) separated by a bridge (26), wherein the rod (29) extends through the first cut-out (22),
    - the rod (29) and the plate (30) are stationary, one to the first element (6) and the other to the second element (8);
    - the bridge (18) of the first energy absorption device (4) opposes the rotation of the second element (8) with respect to the first element (6) around the axis (X2) of the rod (29) of the second energy absorption device (4) in a energy absorption direction (32), and
    - the bridge (28) of the second energy absorption device (4) opposes the rotation of the second element (8) with respect to the first element (6) around the axis (X1) of the rod (19) of the first energy absorption device (2) also in the energy absorption direction (32).
  8. Energy absorption assembly (1) according to claim 7, wherein the first energy absorption device (2) and the second energy absorption device (4) are adapted so that the bridge (28) of the second energy absorption device (4) breaks before the bridge (18) of the first energy absorption device (2) breaks.
EP08865295.3A 2007-12-11 2008-12-08 Reinforced energy absorption device and assembly Active EP2237987B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0708627A FR2924648B1 (en) 2007-12-11 2007-12-11 ENHANCED ENERGY ABSORPTION DEVICE AND ASSEMBLY
PCT/FR2008/052249 WO2009080973A2 (en) 2007-12-11 2008-12-08 Reinforced energy absorption device and assembly

Publications (3)

Publication Number Publication Date
EP2237987A2 EP2237987A2 (en) 2010-10-13
EP2237987B1 EP2237987B1 (en) 2013-07-31
EP2237987B2 true EP2237987B2 (en) 2021-10-20

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Application Number Title Priority Date Filing Date
EP08865295.3A Active EP2237987B2 (en) 2007-12-11 2008-12-08 Reinforced energy absorption device and assembly

Country Status (6)

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US (1) US20100259076A1 (en)
EP (1) EP2237987B2 (en)
CN (1) CN101918243B (en)
DE (1) DE202008017862U1 (en)
FR (1) FR2924648B1 (en)
WO (1) WO2009080973A2 (en)

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Also Published As

Publication number Publication date
EP2237987A2 (en) 2010-10-13
FR2924648B1 (en) 2010-03-19
CN101918243B (en) 2012-11-07
WO2009080973A3 (en) 2009-08-20
US20100259076A1 (en) 2010-10-14
FR2924648A1 (en) 2009-06-12
EP2237987B1 (en) 2013-07-31
DE202008017862U1 (en) 2010-09-23
WO2009080973A2 (en) 2009-07-02
CN101918243A (en) 2010-12-15

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